Having issues, switching to 5G but then does not switch back to EWAN, upgraded to the latest version but then downgraded again with no success. Please advise.

Hello all, I'm the owner the Archer NX600. In advertisement is information that this router can connect with wifi speed up to 2202 Mb/s. I have wifi card 6E, but max speed is 1201 MB/s. I see in setup